Saving objects from different classes into the same array

Processing Coding Questions
6

I didnt finish typing that last one, quick edit.

So instead of doing this:

levels[0] = wall[0], wall[1], wall[2];
levels[1] = wall[0], wall[1];
levels[2] = wall[0], wall[1], wall[2], wall[3], wall[4];

imma do this:

wall[0] = wall(parameters);
wall[1] = wall(parameters);
wall[2] = wall(parameters);
wall[3] = wall(parameters);
wall[4] = wall(parameters);
wall[5] = wall(parameters);
wall[6] = wall(parameters);
wall[7] = wall(parameters);
wall[8] = wall(parameters);
wall[9] = wall(parameters);
wall[10] = wall(parameters);

levels[0] = wall[0] - wall[3];
levels[1] = wall[4] - wall[7];
levels[2] = wall[8] - wall[10];